16c Red & Blue, Air Post Special Delivery, Horizontal Pair, Imperforate Vertically (CE2a). Mint N.H. double plate no. and two "Top" block of six with registration markers, vignette plate no. F21497 and frame plate no. 21492, Positions 1-3/6-8 noted in pencil on back, brilliant color and wide margins, gum crease in bottom right stamp is utterly inconsequential

EXTREMELY FINE. THE UNIQUE PLATE BLOCK OF SIX OF THE 16-CENT RED & BLUE AIR POST SPECIAL DELIVERY ISSUE, IMPERFORATE HORIZONTALLY.

The Datz book states that 10 pairs are reported. In addition to being the unique plate block, the margins are wider on this block than on the three other multiples of three or larger we have encountered (two blocks of four and strip of three)

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